IIT JEE , AIEEE Forum - Physics , Electricity

bubunbhatt

Q. A positive point charge Q is kept inside a neutral conducting shell (not in the centre). An external uniform electric field E is applied. Then

(a) Force on Q due to E is zero.

(b) Net force on Q is zero.

(c) Net force acting on Q and conducting shell considered as a system is zero.

(d) Net force acting on the shell due to E is zero.

Please answer with proper reasoning?????

neeraj_agarwal_1990

i think its A..
since electric field lines cannot enter a conductor...the end normal to the surface of the conductor and then again emerge normal to the other surface(coz all pts of shell are at same potential)

but there is no el. field inside the shell...(except that created by Q)

phyana

i thik the answer is a
the electric feild inside the conducting shell is zero.
hence no force is experineced by the charge inside.

answer c is wrong becaz net force in that case will not be zero.
the sytem in that case poesess a posive charge.hence it will flow in the direction of the feild.

answer d,b is wrong becauz if no force is acting then u cannot say there is "net force that is zero".

plz rate me

krishna.gopal

I do not know what do you mean by force on Q because of E. But one thing is clear that there will be no field acting on Q and hence net force on it will be zero (b) is correct answer.
I think (a) is wrong because the fact that there is no field acting on Q can also be presented in such a way that force on Q because of E is equall and oposite to force on Q because of creation of field because of redistribution of charges on spherical shell

alokmittal

ans a)

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